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Blue-light reception through quaternary transitions.

Christopher Engelhard1, Ralph P Diensthuber2, Andreas Möglich3,4

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|May 5, 2017
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Blue light triggers structural changes in engineered LOV histidine kinase YF1, revealing how sensory photoreceptors transmit signals. This research clarifies light reception mechanisms for novel receptor engineering.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Photobiology

Background:

  • Sensory photoreceptors utilize photosensor and effector modules for light signal transduction.
  • The precise molecular interactions governing light reception in these systems are often not fully understood.

Purpose of the Study:

  • To elucidate the structural dynamics of blue-light reception in the engineered light-oxygen-voltage (LOV) histidine kinase YF1.
  • To provide mechanistic insights into signal transmission pathways in LOV photoreceptors and histidine kinases.

Main Methods:

  • Electron-electron double resonance (ELDOR) spectroscopy.
  • Site-directed spin labelling.
  • Structural modeling based on distance constraints.

Main Results:

  • Light induces rotation and outward movement of LOV photosensor modules in dimeric YF1.
  • Molecular strain is relieved through left-handed supercoiling of the coiled-coil linker.
  • A variant with inverted signaling shows altered dimer interface but similar light-induced linker dynamics.

Conclusions:

  • Detailed structural transitions in YF1 provide a mechanistic model for LOV photoreceptor signal transduction.
  • Findings inform molecular simulations and the design of novel light-regulated biological systems.